After latest fixes, Warp Layer is rendered with simplifications when workarea uses Preview or Draft mode. The speed is more than 3x times faster now.
In previous post I have mentioned that it is impossible to measure speed of Preview and Draft mode. Now there is a new tool, that is shipped with synfigstudio. Currently it is called “vizualization”, but I suggesting to rename it into “synfigplayer”. It plays Synfig files and measures how much time used for rendering operations. Also it allows to choose render engine to be used for visualization. This is how I was able to compare speed increase.
Also, Warp Layer now has new parameter - “Interpolation” - which allows you to optimize quality for final Render.
With all those changes the new implementation of Warp Layer is far faster than in any previous version.